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      //绝对值
      console.log(Math.abs(-1));
      console.log(Math.abs("-1")); //隐式转换
      console.log(Math.abs("pink")); //NaN
      //Math.floor 向下取整
      console.log(Math.floor(3.14));
      console.log(Math.floor(-1.5));
      //Math.ceil向上取整
      console.log(Math.ceil(3.14));
      console.log(Math.ceil(-1.5));
      //Math.round 四舍五入
      console.log(Math.round(5.4));
      console.log(Math.round(5.5));
      console.log(Math.round(-1.5));
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